Author: wma
Date: Wed Sep 21 05:33:18 2016
New Revision: 306070
URL: https://svnweb.freebsd.org/changeset/base/306070

Log:
  Add support for SPI-mapped MSI interrupts outside of GICv2m.
  
  SPI-mapped MSI interrupts coming from a controller other
  than GICv2m need to have their trigger and polarity
  properly configured. This patch fixes MSI/MSI-X
  on Annapurna Alpine platform with GICv2.
  
  Obtained from:         Semihalf
  Submitted by:          Michal Stanek <m...@semihalf.com>
  Sponsored by:          Annapurna Labs
  Reviewed by:           skra, wma
  Differential Revision: https://reviews.freebsd.org/D7698

Modified:
  head/sys/arm/arm/gic.c

Modified: head/sys/arm/arm/gic.c
==============================================================================
--- head/sys/arm/arm/gic.c      Wed Sep 21 05:22:49 2016        (r306069)
+++ head/sys/arm/arm/gic.c      Wed Sep 21 05:33:18 2016        (r306070)
@@ -835,6 +835,26 @@ gic_map_fdt(device_t dev, u_int ncells, 
 #endif
 
 static int
+gic_map_msi(device_t dev, struct intr_map_data_msi *msi_data, u_int *irqp,
+    enum intr_polarity *polp, enum intr_trigger *trigp)
+{
+       struct gic_irqsrc *gi;
+
+       /* Map a non-GICv2m MSI */
+       gi = (struct gic_irqsrc *)msi_data->isrc;
+       if (gi == NULL)
+               return (ENXIO);
+
+       *irqp = gi->gi_irq;
+
+       /* MSI/MSI-X interrupts are always edge triggered with high polarity */
+       *polp = INTR_POLARITY_HIGH;
+       *trigp = INTR_TRIGGER_EDGE;
+
+       return (0);
+}
+
+static int
 gic_map_intr(device_t dev, struct intr_map_data *data, u_int *irqp,
     enum intr_polarity *polp, enum intr_trigger *trigp)
 {
@@ -842,6 +862,7 @@ gic_map_intr(device_t dev, struct intr_m
        enum intr_polarity pol;
        enum intr_trigger trig;
        struct arm_gic_softc *sc;
+       struct intr_map_data_msi *dam;
 #ifdef FDT
        struct intr_map_data_fdt *daf;
 #endif
@@ -860,6 +881,12 @@ gic_map_intr(device_t dev, struct intr_m
                    __func__));
                break;
 #endif
+       case INTR_MAP_DATA_MSI:
+               /* Non-GICv2m MSI */
+               dam = (struct intr_map_data_msi *)data;
+               if (gic_map_msi(dev, dam, &irq, &pol, &trig) != 0)
+                       return (EINVAL);
+               break;
        default:
                return (ENOTSUP);
        }
@@ -907,6 +934,7 @@ arm_gic_setup_intr(device_t dev, struct 
        enum intr_polarity pol;
 
        if ((gi->gi_flags & GI_FLAG_MSI) == GI_FLAG_MSI) {
+               /* GICv2m MSI */
                pol = gi->gi_pol;
                trig = gi->gi_trig;
                KASSERT(pol == INTR_POLARITY_HIGH,
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